Teeth always feel something may be a foreign body in the teeth, it may also be caused by gingivitis, caries and other reasons. 1. Dental foreign body: It is very easy to have a foreign body inside the teeth, when something is stuffed inside the teeth, the teeth will have a foreign body sensation, and it will feel uncomfortable to have something. 2. Gingivitis: The more common cause of gingivitis is the buildup of plaque or bacteria around the teeth. Plaque is a biofilm that naturally accumulates on the teeth and is usually colonized by bacteria attached to the smooth surfaces of the teeth, resulting in a constant feeling of something on the teeth. 3. Dental caries: After filling treatment for dental caries, the feeling of a foreign body on the teeth can also occur over a period of time. This is the main thing is to rinse your mouth in time after eating, in addition to brushing your teeth must be brushed clean, you can also use dental floss to clean the food debris in the gap between the teeth. If necessary, you can go to the stomatology department of the regular hospital, so that professional doctors check and correct treatment.